The following table gives the annual incomes (in thousands of dollars) and amounts (in thousands of dollars) of life insurance policies for eight persons.
|
Annual income
|
42
|
58
|
27
|
36
|
70
|
24
|
53
|
37
|
|
Life insurance
|
150
|
175
|
25
|
75
|
250
|
50
|
250
|
100
|
(a) At the 98% con?dence level, test whether annual income and the amount of life insurance policies are independent.
(b) Find the attained signi?cance level.
(c) State any assumptions you have made in solving the problem.